The 2000 Shell Championship Series was an Australian motor racing series open to V8 Supercars. The championship, which was the second Shell Championship Series, began on 11 February at the Phillip Island Grand Prix Circuit and ended on 19 November at the Mount Panorama Circuit after 13 rounds. Titles were awarded for drivers, teams and manufacturers by the series organisers AVESCO, and the winning driver, Mark Skaife, was also awarded the Australian Touring Car Championship by the Confederation of Australian Motor Sport, the 41st time that this title had been awarded.

The Supercars Championship currently known as the Repco Supercars Championship under sponsorship, is a touring car racing category in Australia and New Zealand, running as an International Series under Fédération Internationale de l'Automobile (FIA) regulations, governing the sport.